Signal Processing Using Pilot Based Coding

1. A method for processing a signal using pilot based coding (PBC), the method comprising: extracting, by an audio coding apparatus, mode information which indicates whether a parameter set is encoded; when the mode information indicates that the parameter set is encoded, obtaining a pilot reference value and one or more pilot difference values; obtaining data elements of a current group included in a current frame using the pilot reference value and the pilot difference values, without using data elements of an other frame; and reconstructing a signal using the data elements of the current group, wherein: the pilot reference value is dependent on each of the data elements of the current group, and is not dependent on the data elements of the other frame, a quantity of the pilot difference values is equal to a quantity of the data elements of the current group; the pilot reference value is a single value which applies to all of the data elements of the current group, and each pilot difference value corresponds to each data element of the current group.

2. The method of claim 1 , wherein the mode information includes at least one of a read mode, a default mode, a previous mode, and an interpolation mode.

3. The method of claim 2 , wherein the pilot reference value and the pilot difference values are obtained when the mode information corresponds to the read mode.

4. The method of claim 3 , wherein the pilot reference value and the pilot difference values are obtained using a first parameter to identify a quantity of the read modes, and a second parameter to obtain the pilot difference values based on the first parameter.

5. The method of claim 1 , wherein the pilot difference value is obtained per group band.

6. The method of claim 1 , wherein the mode information indicates whether the parameter set is encoded in the current group.

7. The method of claim 1 , further comprising: when the mode information indicates that the parameter set is not encoded, obtaining a default parameter set, wherein the signal is reconstructed using the default parameter set.

8. The method of claim 1 , further comprising: when the mode information indicates that the parameter set is not encoded, obtaining a previous parameter set, wherein the signal is reconstructed using the previous parameter set.

9. The method of claim 1 , further comprising: when the mode information indicates that the parameter is not encoded, obtaining an interpolated parameter set, wherein the signal is reconstructed using the interpolated parameter set.

10. The method of claim 1 , wherein the pilot reference value represents an intermediate, average, or most frequently used value associated with the data elements of the current group.

11. The method of claim 1 , wherein the audio coding apparatus comprises a processor.

12. The method of claim 1 , wherein the data elements are obtained using PBC.

13. An audio coding apparatus for processing a signal using pilot based coding (PBC), the apparatus comprising: a decoding part configured to: extract mode information which indicates whether a parameter set is encoded, when the mode information indicates that the parameter set is encoded, obtain a pilot reference value and one or more pilot difference values, and obtain data elements of a current group included in a current frame using the pilot reference value and the pilot difference values, without using data elements of an other frame; and a reconstructing part configured to reconstruct a signal using the data elements of the current group, wherein: the pilot reference value is dependent on each of the data elements of the current group, and is not dependent on the data elements of the other frame, a quantity of the pilot difference values is equal to a quantity of the data elements of the current group; the pilot reference value is a single value which applies to all of the data elements of the current group, and each pilot difference value corresponds to each data element of the current group.

14. The apparatus of claim 13 , wherein the mode information includes at least one of a read mode, a default mode, a previous mode, and an interpolation mode.

15. The apparatus of claim 14 , wherein the pilot reference value and the pilot difference values are obtained when the mode information corresponds to the read mode.

16. The apparatus of claim 15 , wherein the pilot reference value and the pilot difference values are obtained using a first parameter to identify a quantity of the read modes, and a second parameter to obtain the pilot difference values based on the first parameter.

17. The apparatus of claim 13 , wherein the pilot difference value is obtained per group band.

18. The apparatus of claim 13 , wherein the mode information indicates whether the parameter set is encoded in the current group.

19. The apparatus of claim 13 , wherein the pilot reference value represents an intermediate, average, or most frequently used value associated with the data elements of the current group.

20. A system for processing a signal using pilot based coding (PBC), the system comprising: an audio coding apparatus configured to: extract mode information which indicates whether a parameter set is encoded, when the mode information indicates that the parameter set is encoded, obtain a pilot reference value and one or more pilot difference values, obtain data elements of a current group included in a current frame using the pilot reference value and the pilot difference values, without using data elements of an other frame, and reconstruct a signal using the data elements of the current group, wherein: the pilot reference value is dependent on each of the data elements of the current group, and is not dependent on the data elements of the other frame, a quantity of the pilot difference values is equal to a quantity of the data elements of the current group; the pilot reference value is a single value which applies to all of the data elements of the current group, and each pilot difference value corresponds to each data element of the current group.